12
Chapter 2.  Installation and Wiring
Example of wiring with external devices  
(terminals 1–24: sub-base; terminals 25–35: front connector)
z
Flame sensor: UV sensor
F
G
Flame detection 
circuit
Shutter drive 
circuit
Flame sensor
Shutter coil
S1
S2
+
+
ame detector
Flame output
Contact output common
Flame output 
(with start check)
Flame relay N.C. output
L2(N)
K3
Input 
circuit
K5
Control 
circuit 
(CPU)
Contact reset
Start
Input 
common
DC24 V
Flame voltage 
output circuit
FV 
+
FV  −
RS-485
DA
DB
SG
  FL
  SHUT
  AL
DISP 
switch
RESET 
switch
K7 K8
K6
Loader jack
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
10
11
12
33
34
35
Display
Power circuit
2.5 A
Event output
25
35
Terminal layout of connector 
for front wiring
K3:  Start check relay
K5, K7, K8:  Flame relay
K6:  Event relay
  Handling Precautions
•  After mounting the connector for front wiring, secure it in place with the 
mounting screw on the side of the connector.
•  Use the contact reset input (terminal 24) for one AUR only. Do not use the 
terminal for contact reset input to other AUR355 devices.